fix #16650

[ringabout]

fix #16650

when defined case1:
  template fn() =
    echo len(cstring"ab\0c") # ok: \0 is escaped, like r"ab\0c")
    echo len(cstring("ab\0c")) # bug
    let c = cstring("ab\0c") # ok
    echo len(c)
  fn()
  static: fn()

Before:

VM:
5
4
4

RT:
5
4
2

After

VM:
5
4
2

RT:
5
2
2

[timotheecour]

https://nim-lang.github.io/Nim/contributing.html

Always refer to a GitHub issue using the following exact syntax: bug #1234 as shown above, so that it's consistent and easier to search or for tooling. [...]

ditto below

[timotheecour]

Suggested change

	discard
	discard # pending bug #16555

[timotheecour]

Suggested change

	result = newIntNodeT(toInt128(nimCStrLen(a.strVal)), n, g)
	result = newIntNodeT(toInt128(nimCStrLen(a.strVal)), n, g)
	else: assert(0)